Additive manufacturing of three-dimensional object

ABSTRACT

Some examples include an additive manufacturing system including a processor and a memory to store instructions. The instructions cause the processor to generate print data from received data related to a three-dimensional build object. The generated print data includes defined print data to dispensing a first agent at a build area of a build material layer, defined print data to selectively dispensing a second agent at a component receiving area within the build area of the build material layer, the second agent to locally reduce a viscosity of the build material at the component receiving area to a viscous state, and defined print data to position a component within the component receiving area at a time of the component receiving area being in a viscous state.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. Pat. Application No.17/258,315, filed on Jan. 06, 2021, which claims priority toPCT/US2019/013650, filed on Jan. 15, 2019. U.S. Pat. Application No.17/258,315 and PCT/US2019/013650 are incorporated in their entiretyherein.

BACKGROUND

Additive manufacturing machines produce three dimensional (3D) objectsby building up layers of material. Some 3D printing techniques areconsidered additive processes because they involve the application ofsuccessive layers of material. Some additive manufacturing machines arecommonly referred to as “3D printers”. 3D printers and other additivemanufacturing machines make it possible to convert a CAD (computer aideddesign) model of other digital representation of an object into thephysical object.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an example additive manufacturing system inaccordance with aspects of the present disclosure.

FIG. 2 is a schematic diagram of an example additive manufacturingsystem in accordance with aspects of the present disclosure.

FIGS. 3A-3C are schematic cross-sectional side views ofthree-dimensional build objects including a component disposed within acomponent receiving area in accordance with aspects of the presentdisclosure.

FIG. 3D is a schematic cross-sectional top view of a three-dimensionalbuild object including a component disposed within a component receivingarea in accordance with aspects of the present disclosure.

FIG. 4 is a flow diagram of an example additive manufacturing method inaccordance with aspects of the present disclosure.

FIG. 5 is a block diagram of an example non-transitory computer readablemedium comprising a set of instructions executable by a processor inaccordance with aspects of the present disclosure.

DETAILED DESCRIPTION

In the following detailed description, reference is made to theaccompanying drawings which form a part hereof, and in which is shown byway of illustration specific examples in which the disclosure may bepracticed. It is to be understood that other examples may be utilizedand structural or logical changes may be made without departing from thescope of the present disclosure. The following detailed description,therefore, is not to be taken in a limiting sense, and the scope of thepresent disclosure is defined by the appended claims. It is to beunderstood that features of the various examples described herein may becombined, in part or whole, with each other, unless specifically notedotherwise.

It can be useful to track and trace three-dimensional (3D) printedobjects during and/or after fabrication. Optical indicators (e.g.,matrix or two-dimensional barcode, observable surface pattern orroughness, etc.) defined during the 3D printing process provide a meansof allowing the 3D printed object to be scanned and correlated back to adatabase with information about the 3D printed object. However, theseoptical indicators lack the ability to continuously or periodicallymodify data defined within the 3D printed object during the lifecycle ofthe 3D printed object. Additionally, if the 3D printed object is damagedand the optical indicator is marred it could be unreadable and the 3Dprinted object may not be able to be correlated back to a databasestoring information related to the 3D printed object. In accordance withaspects of the present disclosure, additive manufacturing processes canbe used to fabricate three-dimensional (3D) objects including electroniccomponents disposed within the 3D objects (e.g., radio-frequencyidentification devices (RFIDs)) that can be useful in tracking andtracing the 3D object during the lifecycle of the 3D printed object.

Examples of the present disclosure are discussed within the context of aincluding electronic components within a 3D printed object during anadditive manufacturing process. Other components that are pre-formedprior to the additive manufacturing, and embedded within the 3D printedobject, can also be used. It can be useful to embed electroniccomponents and/or other pre-formed components within a 3D printedobject. Conventionally, this has been accomplished by using an additivemanufacturing process in combination with other fabrication processes(which can include other additive manufacturing processes). For example,one or more additive manufacturing processes can be used to fuse andfabricate a body of the 3D printed object. Subsequently, the 3D printedobject is removed from the additive manufacturing system and electroniccomponents and/or other components are added to the object, typically byhand, to be either to be enclosed within the body of the 3D printedobject or to be disposed on a surface of the 3D printed object.Additional additive manufacturing processes can be performed afterinstallation and/or connection of the electronic components, forexample, to enclose the electronic components.

This approach can slow the overall fabrication process, as additivemanufacturing processes are typically paused in order to install andconnect the electronic components, or electronic devices. Moreover, thequality of the physical and electrical connections of the electroniccomponents can be less than optimal depending on the pliability ofregions in which the electronic components are to be disposed, whichbegin to cool and harden once removed from the additive manufacturingsystem.

Examples of the present disclosure fabricate three-dimensional objectsincluding components, such as electronic components, using a singleadditive manufacturing process by leveraging conditions of the singleadditive manufacturing process to facilitate physical and electricalconnection of the electronic components. For instance, during some typesof additive manufacturing processes, such as multi jet fusion processes,heat is used to fuse the materials that form the layers of thethree-dimensional object. Examples of the present disclosure insert acomponent, such as an electronic device or other pre-formed device orobject, into a three-dimensional object being fabricated simultaneouslywith fabrication of the three-dimensional object. Thus, the heat used tofuse the layers of the object layers can also be used to effectivelyfuse the electronic component to the object without employing an extraprocess outside of the additive manufacturing process. Additional layersof the three-dimensional object can subsequently be fabricated over theelectronic component using the same additive manufacturing process. Thisresults in a robust physical and electrical connection between theobject materials and the electronic component with minimal delay ordisruption of the additive manufacturing process.

Examples of the present disclosure are discussed within the context of amulti jet fusion additive manufacturing process. Other types of additivemanufacturing processes and systems, including systems based onthree-dimensional binder jetting can also be employed. In an additivemanufacturing process, a computer controls the spreading of buildmaterial (e.g., powder) and fusing, or binding, agents to formsuccessive layers of material according to a digital model of a 3Dobject. The fusing agents can contain energy absorbing materials orbinding materials that cause the build material to fuse together to formthe object. Additionally, detailing agents can be employed to sharpenthe resolution of the object and provide cooling to selected regionswithin the bed. Functional agents can also be used to providefunctionality to the object (e.g., electrical conductivity), or otheragents. Some agents can serve more than one purpose (e.g., acting asboth a fusing agent and a functional agent, for example). Each of theseagents can be activated under certain conditions such as exposure toheat or energy. Thus, as the successive layers fuse to each other, athree-dimensional object is formed.

FIG. 1 is a block diagram of an example additive manufacturing system100 useful in forming a 3D printed object in accordance with aspects ofthe present disclosure. Additive manufacturing system 100 includes aprocessor 102 and a memory 104. Memory 102 and processor 104 can be incommunication with a data store (not shown) that can include datapertaining to a 3D build object to be formed by the additivemanufacturing system 100. Memory 102 and/or processor 104 can receivedata defining an object to be printed including, for example, 3D objectmodel data. In one example, the 3D object model data includes datarelated to the build object size, shape, position, orientation,conductivity, color, etc. The data can be received from Computer AidedDesign (CAD) systems or other electronic systems useful in the creationof a three-dimensional build object. Processor 104 can manipulate andtransform the received and/or stored data to generate print data.Processor 104 employs print data derived from the 3D build object modeldata of the 3D build object to be formed in order to control elements ofthe additive manufacturing system 100 to selectively deliver/apply buildmaterial, printing agents, and energy.

Processor 102 can control operations of additive manufacturing system100 and can be a semiconductor-based microprocessor, a centralprocessing unit (CPU), and application specific integrated circuit(ASIC), field-programmable gate array (FPGA), and/or other hardwaredevice. Memory 104 can store data, programs, instructions, or any othermachine readable data that can be utilized to operate the additivemanufacturing system 100. Memory 104 can store computer readableinstructions 106 that processor 102 can process, or execute. Memory 102can be an electronic, magnetic, optical, or other physical storagedevice that contains or stores executable instructions 106. Memory 102can be, for example, Random Access Memory (RAM), an ElectricallyErasable Programmable Read-Only Memory (EEPROM), a storage device, anoptical disc, etc. Memory 102 can be a non-transitory machine-readablestorage medium.

Instructions 106 can include a set of instructions 108-114. Instruction108 is to generate print data from received data related to athree-dimensional build object. Instruction 110 can include definingprint data to dispense a first agent at a build area of a build materiallayer. Instruction 112 can include defining print data to selectivelydispense a second agent at a component receiving area within the buildarea of the build material layer, the agent to locally reduce aviscosity of the build material at the component receiving area to aviscous, or molten, state. Instruction 114 can include defining printdata to position a component within the component receiving area at atime of the component receiving area being in a viscous state.

FIG. 2 is a schematic diagram of an example additive manufacturingsystem 200 in accordance with aspects of the present disclosure.Additive manufacturing system 200 includes a processor 202, a memory204, a fluid applicator 216, an energy source 218, and a componentplacement apparatus 221. Processor 202 and memory 204 are similar toprocessor 102 and 104 described above. Memory 204 stores instructions togenerate print data from received data related to a three-dimensionalbuild object. Processor 202 can generate defined print data, which maybe represented as physical (electronic) quantities, in order to causefluid applicator 216 and energy source 218 to create the 3D build objectincluding a component 236, as described further below.

In some examples, additive manufacturing system 200 for fabricating a 3Dobject includes a carriage (not shown) movable relative to a build pad222 along a bi-directional travel path and supporting a fluid applicator(e.g., printhead) 216 and a fusing energy (e.g., radiation) source 218.In some examples, a combination of at least the carriage, energy source218 and fluid applicator 216 can be referred to as a printing assembly.In one example, component placement apparatus 221 is carried on aseparate carriage (not shown). Fluid applicator 216 is to selectivelydispense, or apply, a plurality of fluid agents including a second, orfusing, agent. Fluid applicator 216 can also selectively dispense afirst, or additive, fusing agent, a detailing agent, functional agents,etc. Energy source 218 can heat the build material and agents dispensedonto the build material. Component placement apparatus 221 can positioncomponent 236 (e.g., electronic component or device) within the heatedbuild material, as discussed further below. Processor 202 can generatedefined print data in order to cause fluid applicator 216, energy source218, and component placement apparatus 221 to create the build object230 including component 219 to be embedded into build object 230.Processor 202 can time and order operation of energy source 218, fluidapplicator 216, and component placement apparatus 221, in coordinationwith the carriages.

Fluid applicator 216 is adapted to deposit liquid agents, as indicatedby line 217, such as printing agents onto each build material layer 219a-219 c based on generated print data. Fluid applicator 216 selectivelydeposits printing agents based on the print data. Processor 214 cantransform received data of the build object to generate print dataincluding locations and select the printing agent to be dispensed fromfluid applicator 216. Fluid applicator 216 can include multiple inkjetpens to dispense multiple types of printing agent. In one example, fluidapplicator 216 includes at least one first or second agent pen and atleast one detailing agent pen. In one example, separate printheads areused for each of printing agent and detailing agent. Fluid applicator216 can be carried on a moving carriage system to move across a buildarea 220.

The printing agent can be an energy absorbing liquid that can be appliedto build material 219 a-219 c, for example. More than one type ofsuitable printing agent can be employed. The printing agent dispensableby fluid applicator 216 can be a fusing agent (FA), an activating fusingagent (AFA), a plasticizer functional agent (PFA), a conductive agent(CA) or a detailing agent (DA), and a colorant, for example, asdiscussed further below. In one example, a first, or activating fusing,agent is selectively applied at a build area 232 of layers 219 a-219 band a second, or fusing, agent is applied by fluid applicator 216 tocomponent receiving area 234 within the build area 232 of layer 219 a.

According to one example, a suitable printing, or fusing, agent can bean ink-type formulation comprising carbon black, such as, for example,the fusing agent formulation commercially known as V1Q60Q “HP fusingagent” available from HP Inc. The fusing agent (FA), or higher energyabsorbing fusing agent, can include active agents such as carbon black,carbon nanotubes, graphene, activated carbon, and other carbonizedmaterials. The first (activated fusing) agent (AFA), or lower energyabsorption second (fusing) agent, can include active agents such asnickel dithiolene complexes, cesium-doped tungsten bronze, PEDOT:PSS, orother IR absorbing materials. The conductive agent (CA) can includeconductive material including transition metal (e.g., silver, copper,gold, platinum, palladium, chromium, nickel, zinc, etc.) nanomaterials(e.g., nanoparticles, nanorods, nanowires, nanotubes, nanosheets, etc.).The conductive agent can also include transition metal alloynanomaterials, such as Au—Ag, Ag—Cu, Ag—Ni, Au—Cu, Au—Ni, Au—Ag— Cu, orAu—Ag—Pd, conductive oxides (e.g., indium tin oxide, antimony oxide,zinc oxide, etc.), conducting polymers (e.g.,poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS),polyacetylene, polythiophenes, any other conjugated polymer, etc.),carbonaceous nanomaterials (e.g., graphene (single or multi-layer),carbon-nanotubes (CNTs, single or multi-walled), graphene nanoribbons,fullerenes, etc.), and reactive metal systems. The plasticizer agent(PA) can include 2-methyl-benzene sulfonamide, a mixture of4-methyl-benzene and 2-methyl-benzene sulfonamide,N-butylbenzenesulfonamide (BBSA), N-ethylbenzenesulfonamide (EBSA),N-propylbenzenesulfonamide (PBSA), N-butyl-N-dodecylbenzenesulfonamide(BDBSA), N,N-dimethylbenzenesulfonamide (DMBSA),p-methylbenzenesulfonamide, o/p-toluene sulfonamide, p-toluenesulfonamide, 2-ethylhexyl-4-hydroxybenzoate,hexadecyl-4-hydroxybenzoate,1-butyl-4-hydroxybenzoate, dioctylphthalate, diisodecyl phthalate, di-(2-ethylhexyl) adipate,tri-(2-ethylhexyl) phosphate, and combinations thereof. The agents canalso include water, surfactant, dispersant, humectant, biocide,anti-kogation agent and other additives.

The fusing agent, or second agent, can have a higher heating efficiencythan the activating fusing agent, or first agent. This higher heatingefficiency can be useful given that selectively applying the secondagent in build area 232 created with the first agent can result inselectively heating the specific component receiving area 234 within thebuild material which in turn reduces the viscosity of that selectedcomponent receiving area 234 of the build material. In one example,application of energy to layer 219 a including second agent raises thetemperature of the second agent applied component receiving area 234 toa temperature sufficient to create a lower viscosity melt pool that willbe receptive to component 236 being inserted in to component receivingarea 234 (but below a critical temperature of component 236 that wouldcause failure of the component, such as with an electronic device). Forinstance, the temperature of component receiving area 234 where thesecond agent was applied may be raised to a temperature at or above itsmelt temperature. Thus, the second agent printed section (i.e.,component receiving area 234) can be heated to a significant temperaturehotter than the surrounding sections (i.e., build area 232) that ispatterned with the activated fusing agent. In some examples, the secondagent patterned region can be heated 5 to 50° C. more than the firstagent patterned region. In one example, the second agent patternedregion can be heated approximately 15° C. more than the first agentpatterned region. The first agent can be an ink-type formationcomprising nickel-dithiolene complexes.

In one example, the second agent can have a higher heating efficiencythan the first agent and can physio-chemically reduce the viscosity ofthe build material. The second agent can also include a plasticizerfunctional agent. The plasticizer functional agent can also be anink-type formation and can be similarly employed. The plasticizerfunctional agent can also be useful to reduce the viscosity of the buildmaterial at select areas by chemically altering the melt characteristicsof the build material. In one example, the plasticizer functional agentcan decrease the melt viscosity of the build material through aphysiochemical means. In one example, multiple second agents, such as afusing agent and a plasticizer functional agent, can be applied tolocally reduce the viscosity of the build material at the componentreceiving area.

Printing agent can be applied to build material. Build material can bedeposited onto a build surface 222 to form build material layer 219.Build surface can be a surface of a platen or underlying build layers ofbuild material on a platen within a build chamber, for example. A buildmaterial supply device 224 can supply and deposit successive layers ofbuild material to form a build volume within a build area 220. Buildmaterial supply device 224 can be moved across build surface 222 withinthe build area on a carriage, for example. Build material can be apowder polymer-based type of build material. Build material can includepolymer, ceramic, metal, or composite powders (and powder-likematerials), for example. Polymeric build material can be crystalline orsemicrystalline polymers in powder form. In some examples, the powdermay be formed from, or may include, short fibers that may, for example,have been cut into short lengths from long strands or threads ofmaterial. According to one example, a suitable build material may bePA12 build material commercially known as V1R10A “HP PA12” availablefrom HP Inc.

Build area 220 can be defined as a three-dimensional space in which theadditive manufacturing system 200 can fabricate, produce, or otherwisegenerate a three-dimensional build object 230 (illustrated partiallyformed). Build area 220 can occupy a three-dimensional space on top of abuild area surface, such as a build area bed or platen, 222. In oneexample, the width and length (x and y directions) of build area 220 canbe the width and the length of build area platform and the height ofbuild area 220 can be the extent to which build area platform can bemoved in the z direction. Although not shown, an actuator, such as apiston, can control the vertical position of build area platen 222.

Energy source 218 can apply fusing energy, indicated by lines 223, tobuild material and printing agents of build material layers 219 a-219 con build area surface 222 in order to form the object layers. Additionallayers 219 d-219 x (not shown) can be formed above and below layers 219a-219 c. Energy source 218 can generate heat that is absorbed by fusingenergy absorbing components of the printing agents to sinter, melt,fuse, or otherwise coalesce the patterned build material. In someexamples, energy source 218 can apply a heating energy, to heat thebuild material to a pre-fusing temperature, and a fusing energy, to fuseand/or selectively transition the build material temporarily to aviscous state where the printing agents have been applied. Thermal,infrared, visible light or ultraviolet energy can be used, for example,to heat and fuse the material. Energy source 218 can be mounted to thecarriage system and moved across build surface 222 to apply the heatingand fusing energies to the printing agent patterned build material. 218can be moved over the bed one or more times to provide sufficientheating.

Build material and printing agents in each build material layer 219a-219 x can be exposed to energy source 218, such as a thermal energysource. Energy source 218 can include a heating source to heat buildmaterial layer and a fusing source to fuse the first agent with thebuild material in locations that the first agent is selectively appliedand to locally reduce the viscosity of the build material with theapplied second agent to a molten state in locations that the secondagent (e.g., fusing agent, plasticizer functional agent) is selectivelyapplied. Energy source 218 can be split into the different energysources. This can include one that is fixed above the build bed and onethat is attached or separate from the print carriage and moves over thebed during prescribed times. One or both of these separate energysources can be used to create the molten or viscous build material stateduring or after the formation of layer 219 a.

The first agent can facilitate fusing of the build material, whereprinted or applied, by absorbing energy from the fusing energy sourceand converting the energy to heat to raise the temperature of the buildmaterial above the melting or softening point to fuse and form theobject body. The second agent (e.g., fusing agent) can facilitatetemporarily locally reducing the viscosity of the build material, whereprinted or applied, by absorbing energy at a higher heating efficiencyfrom the fusing energy source and converting the energy to heat to raisethe temperature of the build material to a viscous, or molten, state.Component 236 can be embedded into the molten build material where theagent has been applied (e.g., component receiving area 234), asdiscussed further below.

The agent can selectively reduce the viscosity of the build material atthe component receiving area 234. The heat used to fuse the layers ofthe object layers can also be used to effectively fuse component 236 toand within the object layers without employing an extra process outsideof the additive manufacturing process. The mechanism or process forfusing component 236 into position within build material layer(s) caninclude sintering, liquid evaporation or decomposition, chemical bondingbetween particles, (e.g., direct metal-metal bonding), drying, and/orother types of fusing processes. Additional layers of thethree-dimensional object can subsequently be fabricated over thecomponent 236 using the same additive manufacturing process. In oneembodiment, additional layers of the three-dimensional object are formedas a separate part and assembled to the layers formed with component 236embedded within.

Component placement apparatus 221 is to position component 236 within athree-dimensional object being fabricated simultaneously withfabrication of the three-dimensional object. Component placementapparatus 221 can be carried on a carriage movable across the print bed222. In one example, component placement apparatus 221 can be connectedto fluid applicator 216 and/or energy source 218, allowing it to movesimultaneously with or separate from fluid applicator 216 and/or energysource 218. Component placement apparatus 221 is controlled by processor202 for automated placement of component 236. Component placementapparatus 221 can be an automated “pick and place” apparatus.

In one example, component placement apparatus 221 can include y andz-axis actuators, a connector arm, a nozzle, a controllable vacuumsource (not shown). Other suitable mechanisms are also acceptable. Inone example, component 236 can be selectively engaged with anddisengaged from the nozzle (via suction of the vacuum source) forcarrying and placing or positioning component 236. The actuators andconnector arm can be employed to move component 236 vertically andhorizontally (e.g., along y and z axes) to position component 236appropriately and apply force to embed component 236 within the moltencomponent receiving area 234. As the component 236 is positioned intothe molten material of component receiving area 234 to embed component236, the molten material (i.e., build material and agent) is displacedinto the surrounding material layer. In one example, component placementapparatus 221 maintains a moderate pressure on component 236 for apredetermined time to provide a strong adhesion between the materialforming the 3D object layer and component 236 before being released, ordisengaging, from component placement apparatus.

In some examples, component 236 is a pre-formed functioning electronicdevice and includes electronic components. In some examples, component336 can be any type of receiver-transmitter component that is capable oftransmitting a reply signal when electronically interrogated. In oneexample, the electronic device is a radio-frequency identificationdevice (RFID). The RFID can communicate with an external, remotecommunication source. Other types of electronic devices including anytype of passive and/or active electronic component (e.g., resistor,transistor, capacitor, diode, inductor, battery, wire or conductive pin,universal serial bus connector or other electronic connector, sensor,integrated circuit, etc.) can also be employed.

FIGS. 3A-3C are schematic cross-sectional side views ofthree-dimensional build objects 330 a-330 c including component 336a-336 c disposed within component receiving area 334 a-334 c inaccordance with aspects of the present disclosure. Build layers 319b-319 d form build areas 332 and component receiving area 334. Eachcomponent 336 a-336 c can include a top surface 338a-c, a bottom surface340a-c, and side surfaces 342a-c extending between top surface 338a-cand bottom surface 340a-c. Component 336 a-336 c has a thickness“t₁″-”t₃” and the build material layer that component 336 a-336 c isembedded in has a thickness “d₁”. Build material layers 319 b-319 d canhave equivalent, or substantially equivalent thicknesses or can bedifferent thicknesses. Component 336 is placed within a layer, orlayers, of build material 319 b-319 d at component receiving area 334.Component 336 is positioned a pre-determined distance (along the z-axis)within the build material layers 319b-d. Although only one component 336is illustrated, it is understood that multiple components 336 can beincluded either within the same build layer or within different buildlayers 319 a-319 x.

In one example, as illustrated in FIG. 3A, component 336 a has athickness “t₁” approximately equal to the thickness “d₁” of layer 319 cof the 3D object 330 a. In this example, component 336 a can be forceddownward into the build layer 319 c thickness to embed component 336 awithin the build layer 319 c and within the build object 330 a with amoderate amount of pressure. In one example, top surface 338 a ofcomponent 336 a can be flush, or substantially flush, with top surface344 a of build material layer 319 c that component 336 a is embeddedwithin. As used herein, the term “flush” refers to arrangements wherethe surfaces are flush (i.e., coplanar or level). Layer 319 d can beformed over layer 319 c to encapsulate, or fully embed or enclosecomponent 336 a within 3D object 330 a.

In another example, as illustrated in FIG. 3B, component 336 b can bepositioned to extend into the layer 319 b below layer 319 c that agentis dispensed at. In one example, the energy absorbed by the agent at thecomponent receiving area 334 in layer 319 c can “bleed” into andpartially extend into layer 319 b. This allows the component to beplaced into, or recessed into, the layer(s) while at least one layer isin a molten state. Component 336 b can be positioned and inserted intothe molten build material at the component receiving area 334 b withenough pressure to at least partially embed the electronic component incomponent receiving area 334 b, but not so much pressure that thecomponent 334 b contact fused material below the molten material of thecomponent receiving area 334 b. In this manner, component 336 b can beembedded into layers 319 b and 319 c while build material contacted bythe agent is in a molten state. Top surface 338 a can be recessed,flush, substantially flush, or extend slightly above top surface 344 bof build material layer 319 c.

FIG. 3C illustrates component 336 c embedded within layer 319 c andextending above top surface 344 c of layer 319 c. Component 336 c can begreater than a single material layer thickness and less than thethickness of two layers of 3D object 330 c. Top surface 338 c ofcomponent 336 c is positioned below a top surface of layer 319 d toallow the build material to be spread in layer 319 d without thespreading device contacting component in any substantial manner. Theagent dispensed at component receiving area 334 c of layer 319 cprovides a molten state of material for bonding with electroniccomponent 336.

FIG. 3D illustrates a cross-sectional view through layer 391 c inaccordance with aspects of the present disclosure. Component 336 isembedded within component receiving area 334. Component 336 can besurrounded by the viscous material of component receiving area 334 alongsides 342. Component 336 is bonded to the fused material surroundingcomponent 336.

In one example, electronic component 336 is electrically connected to aconductive region 350 within 3D object 330. Conductive region 350 can beformed with the build layer(s) with a printed electrically conductiveagent into a specific region or can be added as an additional electricalcomponent placed within, or onto, the build layers in accordance withaspects of the present disclosure. Conductive region 350 is illustratedas a single linear conductive region, however, conductive region 350 caninclude multiple conductive regions and can extend through multiplelayers and in multiple directions and orientations.

In one example, conductive region 350 can form an antenna for electroniccommunication with electronic component 336 (e.g., RFID). In oneexample, conductive region 350 can be formed, or printed, as an antennawithin the 3D build object during a Multi Jet Fusion process. Electronicdevice 336 can be embedded within the 3D build object (pursuant to thedata representation of the CAD model) to preserve the structuralintegrity of the 3D object 330 and that allows electronic component 336to communicate with one or more scanning systems. In one example, whereelectronic component 336 is disposed near an exterior surface or edge,employing a plasticizer agent as the second agent applied to componentreceiving area 334 can provide for lower melt viscosity near theexterior surface or edge of the 3D object and maintain the dimensionalaccuracy of the 3D object. In one example, electronic component 336 canbe disposed at a central location within the 3D object, spaced fromexterior or exposed surfaces of the 3D object to aid in maintainingdimensional accuracy of the 3D object. Conductive region 350 (e.g.,antenna) can be employed to aid in the communication. Component 236,336, such as an RFID, can contain a variety of information, such asidentification information, routing information, safety information,handling information, shipping information, and other build andpost-build information.

Although FIGS. 2 and 3A-3D illustrate a single component being insertedinto a single layer of a 3D object, examples of the present disclosurecan be used to insert and embed any number and type of components intoone or any number of layers of the 3D object. Moreover, the number ofcomponents can include a variety of different types of components.

FIG. 4 is a flow diagram of an example additive manufacturing method 400in accordance with aspects of the present disclosure. At 402, a layer ofbuild material is distributed onto a print bed. At 404, a first agent isdispensed at a build area of the build material layer. At 406, a secondagent is selectively dispensed at a component receiving area within thebuild area of the build material layer. At 408, a viscosity of the buildmaterial is locally reduced at the component receiving area to a viscousstate. At 410, component is positioned within a thickness of the buildmaterial layer at the component receiving area while the build materialat the component receiving area is in the viscous state.

FIG. 5 is a block diagram of an example non-transitory computer readablemedium 500 comprising a set of instructions executable by a processor inaccordance with aspects of the present disclosure. In one example,non-transitory computer-readable storage medium 500 is included in thememory of the additive manufacturing system and includes a set ofinstructions 502-506 executable by the processor. Instruction 502 candefine print data to dispense a first agent at a build area of aplurality of build material layers. Instruction 504 can define printdata to selectively dispense a second agent at a component receivingarea within the build area, the agent to locally reduce a viscosity ofbuild material at the component receiving area to a viscous state.Instruction 506 can define print data to position a component within thecomponent receiving area at a time of the component receiving area beingin a viscous state.

Although specific examples have been illustrated and described herein, avariety of alternate and/or equivalent implementations may besubstituted for the specific examples shown and described withoutdeparting from the scope of the present disclosure. This application isintended to cover any adaptations or variations of the specific examplesdiscussed herein. Therefore, it is intended that this disclosure belimited only by the claims and the equivalents thereof.

1. An additive manufacturing system comprising: a processor; and amemory to store instructions to cause the processor to: generate printdata from received data related to a three-dimensional build object, thegenerated print data comprising: defined print data to dispense a firstagent at a build area of a build material layer, defined print data todispense a second agent at a component receiving area within the buildarea of the build material layer, the second agent to locally reduce aviscosity of the build material at the component receiving area to aviscous state, and defined print data to position a component within thecomponent receiving area at a time of the component receiving area beingin a viscous state.
 2. The additive manufacturing system of claim 1,comprising: a printhead to dispense the first agent onto the buildmaterial at the build area and to selectively dispense the second agentat the component receiving area within the build area based on thegenerated print data; an energy source to apply fusing energy to fuse aportion of the build object at the build area and to bring to a viscousstate and fuse a portion of the build object at the component receivingarea; and a component placement apparatus to selectively engage,position, and release the component at the component receiving area. 3.The additive manufacturing system of claim 2, wherein the componentplacement apparatus is to exert a force onto the component to embed thecomponent a pre-determined distance within a thickness of the buildmaterial layer at the component receiving area.
 4. The additivemanufacturing system of claim 3, wherein the component has a thicknessgreater than a thickness of the build material layer.
 5. The additivemanufacturing system of claim 1, wherein the second agent has a higherheating or physiochemical efficiency than the first agent.
 6. Theadditive manufacturing system of claim 1, wherein the second agent tolocally reduce a viscosity of the build material at the componentreceiving area includes the second agent to thermally activate with thebuild material.
 7. The additive manufacturing system of claim 1,comprising: defined print data to apply a fusing energy at the componentreceiving area within the build area of the build material layer; andthe fusing energy to fuse the build material at the build area and tolocally reduce the build material to a viscous state.
 8. The additivemanufacturing system of claim 7, wherein the viscous build material andthe second agent at the component receiving area bond the component tothe build material within the component receiving area.
 9. An additivemanufacturing system comprising: a processor; and a memory to storeinstructions to cause the processor to: generate print data fromreceived data related to a three-dimensional build object, the generatedprint data comprising: defined print data to dispense a first agent at abuild area of a build material layer, the build material area includesbuild material within a component receiving area and build materialoutside of the component receiving area; defined print data to dispensea second agent at the component receiving area within the build area ofthe build material layer, the second agent to locally reduce a viscosityof the build material at the component receiving area to a viscous staterelative to the build material outside of the component receiving area,and defined print data to position a component within the componentreceiving area at a time of the component receiving area being in aviscous state.
 10. The additive manufacturing system of claim 9,comprising: a printhead to dispense the first agent onto the buildmaterial at the build area and to selectively dispense the second agentat the component receiving area within the build area based on thegenerated print data; an energy source to apply fusing energy to fuse aportion of the build object at the build area and to bring to a viscousstate and fuse a portion of the build object at the component receivingarea; and a component placement apparatus to selectively engage,position, and release the component at the component receiving area. 11.The additive manufacturing system of claim 10, wherein the componentplacement apparatus is to exert a force onto the component to embed thecomponent a pre-determined distance within a thickness of the buildmaterial layer at the component receiving area.
 12. The additivemanufacturing system of claim 11, wherein the component has a thicknessgreater than a thickness of the build material layer.
 13. The additivemanufacturing system of claim 9, wherein the second agent has a higherheating or physiochemical efficiency than the first agent.
 14. Theadditive manufacturing system of claim 9, wherein the second agent tolocally reduce a viscosity of the build material at the componentreceiving area includes the second agent to thermally activate with thebuild material.
 15. The additive manufacturing system of claim 9,comprising: defined print data to apply a fusing energy at the componentreceiving area within the build area of the build material layer; andthe fusing energy to fuse the build material at the build area and tolocally reduce the build material to a viscous state.
 16. The additivemanufacturing system of claim 15, wherein the viscous build material andthe second agent at the component receiving area bond the component tothe build material within the component receiving area.